The Dow dives

August 4, 2011 3:45 PM

Traders work on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York.

Traders work on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York.

Photo: Jin Lee, AP

Traders work on the floor of the New York Stock Exchange on... Photo-1284969.19803 - San Antonio Express-News

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Traders work on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York. (AP Photo/Jin Lee)

Traders work on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York. (AP Photo/Jin Lee)

Photo: Jin Lee, AP

Traders work on the floor of the New York Stock Exchange on... Photo-1285137.19803 - San Antonio Express-News

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A trader works on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York.

A trader works on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York.

Photo: Jin Lee, AP

A trader works on the floor of the New York Stock Exchange on... Photo-1284962.19803 - San Antonio Express-News

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Traders work on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York.

Traders work on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York.

Photo: Jin Lee, AP

Traders work on the floor of the New York Stock Exchange on... Photo-1284964.19803 - San Antonio Express-News

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A monitor displays Dow Jones Industrial Average as traders watch from their booth on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York. The Dow Jones industrial average plunged more than 300 points and erased its gains for the year as investors grew more concerned about economic weakness in the U.S. and Europe. less

A monitor displays Dow Jones Industrial Average as traders watch from their booth on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011 in New York. The Dow Jones industrial average plunged more ... more